Can serum ionic magnesium disturbance increase the frequency of exacerbations in COPD? - A hospital based multi group case control study. International Journal of Biomedical and Advance Research, [S. l.], v. 8, n. 9, p. 359–365, 2017. DOI: 10.7439/ijbar.v8i9.4408. Disponível em: https://ssjournals.co.in/index.php/ijbar/article/view/4408. Acesso em: 13 mar. 2026.